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<head><meta charset="utf-8"><title>pre-meeting triage 2019-11-14 #54818 · t-compiler · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/index.html">t-compiler</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html">pre-meeting triage 2019-11-14 #54818</a></h3>

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<a name="180715846"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180715846" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180715846">(Nov 14 2019 at 10:04)</a>:</h4>
<p>I will be doing pre-triage in this channel.</p>



<a name="180716320"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180716320" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180716320">(Nov 14 2019 at 10:10)</a>:</h4>
<p>first up: <a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+-label%3AP-high++-label%3AP-medium+-label%3AP-low+label%3AI-nominated" target="_blank" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+-label%3AP-high++-label%3AP-medium+-label%3AP-low+label%3AI-nominated">unprioritized nominated T-compiler issues</a></p>



<a name="180716339"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180716339" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180716339">(Nov 14 2019 at 10:10)</a>:</h4>
<p>unpri nom 1/10: "<code>clippy-driver</code> no longer builds after <a href="https://github.com/rust-lang/rust/issues/66233" target="_blank" title="https://github.com/rust-lang/rust/issues/66233">rust-lang/rust#66233</a>" <a href="https://github.com/rust-lang/rust/issues/66409" target="_blank" title="https://github.com/rust-lang/rust/issues/66409">#66409</a></p>



<a name="180716347"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180716347" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180716347">(Nov 14 2019 at 10:10)</a>:</h4>
<p>P-medium. removing nomination.</p>



<a name="180716391"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180716391" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180716391">(Nov 14 2019 at 10:11)</a>:</h4>
<p>unpri nom 2/10: "Compiler error while compiling Winrt" <a href="https://github.com/rust-lang/rust/issues/66402" target="_blank" title="https://github.com/rust-lang/rust/issues/66402">#66402</a></p>



<a name="180716759"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180716759" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180716759">(Nov 14 2019 at 10:17)</a>:</h4>
<p>classifying as P-high for now. Though the lack of a MCVE and the fact that the witnessing crate is presumably Windows-specific adds a bit of impedance to addressing this.</p>



<a name="180716800"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180716800" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180716800">(Nov 14 2019 at 10:17)</a>:</h4>
<p>unpri nom 3/10: "Compiler crash on "if" without "else" in async fn" <a href="https://github.com/rust-lang/rust/issues/66387" target="_blank" title="https://github.com/rust-lang/rust/issues/66387">#66387</a></p>



<a name="180716849"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180716849" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180716849">(Nov 14 2019 at 10:18)</a>:</h4>
<p>has PR</p>



<a name="180716858"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180716858" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180716858">(Nov 14 2019 at 10:18)</a>:</h4>
<p>classifying as P-high.</p>



<a name="180716893"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180716893" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180716893">(Nov 14 2019 at 10:18)</a>:</h4>
<p>(we have unnominated a few PRs which got PRs before the meeting)</p>



<a name="180716898"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180716898" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180716898">(Nov 14 2019 at 10:18)</a>:</h4>
<p>(we = release team)</p>



<a name="180716953"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180716953" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180716953">(Nov 14 2019 at 10:19)</a>:</h4>
<p>unpri nom 4/10: "Internal Compiler Error @ parser.rs:446:22" <a href="https://github.com/rust-lang/rust/issues/66357" target="_blank" title="https://github.com/rust-lang/rust/issues/66357">#66357</a></p>



<a name="180717001"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717001" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717001">(Nov 14 2019 at 10:20)</a>:</h4>
<p>I fixed yesterday <span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span></p>



<a name="180717016"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717016" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717016">(Nov 14 2019 at 10:20)</a>:</h4>
<p>yeah I remember laughing when I saw <code>fn f() { |[](* }</code></p>



<a name="180717029"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717029" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717029">(Nov 14 2019 at 10:20)</a>:</h4>
<p>:D</p>



<a name="180717050"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717050" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717050">(Nov 14 2019 at 10:21)</a>:</h4>
<p>classifying as P-high, unnominating.</p>



<a name="180717085"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717085" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717085">(Nov 14 2019 at 10:21)</a>:</h4>
<p>unpri nom 5/10: "ICE when using reference variable from iterator (instead of copying it): thread 'rustc' panicked at 'already borrowed: BorrowMutError'" <a href="https://github.com/rust-lang/rust/issues/66353" target="_blank" title="https://github.com/rust-lang/rust/issues/66353">#66353</a></p>



<a name="180717145"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717145" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717145">(Nov 14 2019 at 10:22)</a>:</h4>
<p>has PR, r+ed</p>



<a name="180717312"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717312" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717312">(Nov 14 2019 at 10:24)</a>:</h4>
<p>(just reading over the PR myself, and thinking about the borrow_mut failure)</p>



<a name="180717517"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717517" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717517">(Nov 14 2019 at 10:27)</a>:</h4>
<p>I r+ed it because we can do the principled fix some other time</p>



<a name="180717523"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717523" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717523">(Nov 14 2019 at 10:27)</a>:</h4>
<p>I'm musing about a debugging variant of <code>RefCell</code> that stored a stack-trace on each borrow, so that a <code>borrow_mut</code> failure could actually print a stack trace</p>



<a name="180717526"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717526" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717526">(Nov 14 2019 at 10:27)</a>:</h4>
<p>(assuming there is one)</p>



<a name="180717532"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717532" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717532">(Nov 14 2019 at 10:27)</a>:</h4>
<p>anyway I'm not going to do this now</p>



<a name="180717601"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717601" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717601">(Nov 14 2019 at 10:28)</a>:</h4>
<p>P-high. Removing nomination label.</p>



<a name="180717646"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717646" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717646">(Nov 14 2019 at 10:29)</a>:</h4>
<p>unpri nom 6/10: "Spurious x86_64 Windows CI failures due to OOM" <a href="https://github.com/rust-lang/rust/issues/664342" target="_blank" title="https://github.com/rust-lang/rust/issues/664342">#664342</a></p>



<a name="180717755"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717755" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717755">(Nov 14 2019 at 10:30)</a>:</h4>
<p>has PR. P-high. Removing nomination label.</p>



<a name="180717791"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717791" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717791">(Nov 14 2019 at 10:30)</a>:</h4>
<p>unpri nom 7/10: "<code>miri</code> no longer builds after <a href="https://github.com/rust-lang/rust/issues/66252" target="_blank" title="https://github.com/rust-lang/rust/issues/66252">rust-lang/rust#66252</a>" <a href="https://github.com/rust-lang/rust/issues/66301" target="_blank" title="https://github.com/rust-lang/rust/issues/66301">#66301</a></p>



<a name="180717805"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717805" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717805">(Nov 14 2019 at 10:31)</a>:</h4>
<p>P-medium, removing nomination.</p>



<a name="180717894"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717894" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717894">(Nov 14 2019 at 10:32)</a>:</h4>
<p>unpri nom 8/10: "thread 'rustc' panicked at 'called <code>Option::unwrap()</code> on a <code>None</code> value'" <a href="https://github.com/rust-lang/rust/issues/66286" target="_blank" title="https://github.com/rust-lang/rust/issues/66286">#66286</a></p>



<a name="180717904"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717904" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717904">(Nov 14 2019 at 10:32)</a>:</h4>
<p>has PR. P-high. Removing nomination label.</p>



<a name="180717947"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180717947" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180717947">(Nov 14 2019 at 10:33)</a>:</h4>
<p>unpri nom 9/10: "improper_ctypes fires for &amp;mut T, &amp;T, *const T and *mut T" <a href="https://github.com/rust-lang/rust/issues/66220" target="_blank" title="https://github.com/rust-lang/rust/issues/66220">#66220</a></p>



<a name="180718023"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180718023" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180718023">(Nov 14 2019 at 10:34)</a>:</h4>
<p>so I nominated this, in part to decide if we should wait for nuance or post reverting PR. Since I nominated, a reversion PR was posted, r+'ed by eddyb, then r-'ed by rkruppe due to my own nomination (presumably they didn't want to step on our toes), and then re-r+'ed by me this morning.</p>



<a name="180718107"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180718107" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180718107">(Nov 14 2019 at 10:35)</a>:</h4>
<p>I'm going to triage it as P-high, but <em>leave</em> it nominated. I want to try to discuss at the meeting, at least for a little bit, what philosophy we want to follow when it comes to the Question of how eagerly to revert PR's in situations like this.</p>



<a name="180718191"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180718191" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180718191">(Nov 14 2019 at 10:36)</a>:</h4>
<p>(And also, i think the actual PR itself, in terms of the approach we want to strive for, is also worth discussing.)</p>



<a name="180718316"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180718316" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180718316">(Nov 14 2019 at 10:38)</a>:</h4>
<p>unpri nom 10/10: "sysroot spans are not printed on some targets (affected: Debian, rust-lang's own i586; unaffected: Fedora)" <a href="https://github.com/rust-lang/rust/issues/53081" target="_blank" title="https://github.com/rust-lang/rust/issues/53081">#53081</a></p>



<a name="180718498"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180718498" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180718498">(Nov 14 2019 at 10:40)</a>:</h4>
<p>marking P-high. Leaving nominated: the team should discuss solutions to this, maybe actually task someone with coming up with something.</p>



<a name="180718673"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180718673" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180718673">(Nov 14 2019 at 10:42)</a>:</h4>
<p>next up: <a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+label%3Aregression-from-stable-to-beta++-label%3AP-high++-label%3AP-medium+-label%3AP-low+-label%3AT-libs+-label%3AT-infra+-label%3AT-rustdoc" target="_blank" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+label%3Aregression-from-stable-to-beta++-label%3AP-high++-label%3AP-medium+-label%3AP-low+-label%3AT-libs+-label%3AT-infra+-label%3AT-rustdoc">beta-regressions without P-label</a></p>



<a name="180718711"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180718711" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180718711">(Nov 14 2019 at 10:43)</a>:</h4>
<p>unpri beta-reg 1/2: "Large locals can cause OOMs during the <code>ConstProp</code> pass" <a href="https://github.com/rust-lang/rust/issues/66397" target="_blank" title="https://github.com/rust-lang/rust/issues/66397">#66397</a></p>



<a name="180718725"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180718725" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180718725">(Nov 14 2019 at 10:43)</a>:</h4>
<p>has PR. P-high.</p>



<a name="180718789"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180718789" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180718789">(Nov 14 2019 at 10:44)</a>:</h4>
<p>nominating the associated PR (<a href="https://github.com/rust-lang/rust/issues/66394" target="_blank" title="https://github.com/rust-lang/rust/issues/66394">#66394</a>) for beta backport; but it only went up 10 hours ago so I don't expect us to actually backport it this week...</p>



<a name="180718897"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180718897" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180718897">(Nov 14 2019 at 10:45)</a>:</h4>
<p>unpri beta-reg 2/2: "SIGSEGV compiling num-integer for asmjs-unknown-emscripten" <a href="https://github.com/rust-lang/rust/issues/66308" target="_blank" title="https://github.com/rust-lang/rust/issues/66308">#66308</a></p>



<a name="180719098"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719098" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719098">(Nov 14 2019 at 10:48)</a>:</h4>
<p>what tier is this target?</p>



<a name="180719111"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719111" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719111">(Nov 14 2019 at 10:48)</a>:</h4>
<p>lemme check</p>



<a name="180719132"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719132" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719132">(Nov 14 2019 at 10:48)</a>:</h4>
<p>tier 2</p>



<a name="180719137"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719137" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719137">(Nov 14 2019 at 10:48)</a>:</h4>
<p>okay</p>



<a name="180719204"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719204" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719204">(Nov 14 2019 at 10:49)</a>:</h4>
<p>I'm going to triage this as P-high for now, at least for the initial investigation</p>



<a name="180719252"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719252" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719252">(Nov 14 2019 at 10:50)</a>:</h4>
<p>but given that its a tier 2 target ... well, I'll just say that I'm not committed to P-high for the long term.</p>



<a name="180719341"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719341" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719341">(Nov 14 2019 at 10:51)</a>:</h4>
<p>next up: nightly regressions without P-label ... there are none! <span aria-label="smiley" class="emoji emoji-1f603" role="img" title="smiley">:smiley:</span></p>



<a name="180719464"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719464" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719464">(Nov 14 2019 at 10:53)</a>:</h4>
<p>next up: reviewing all <a href="https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AI-nominated+label%3AT-compiler" target="_blank" title="https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AI-nominated+label%3AT-compiler">nominated</a> issues to see if any should be unnominated (e.g. if they were discussed last week)</p>



<a name="180719491"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719491" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719491">(Nov 14 2019 at 10:54)</a>:</h4>
<p>we already discussed <a href="https://github.com/rust-lang/rust/issues/66220" target="_blank" title="https://github.com/rust-lang/rust/issues/66220">#66220</a> and <a href="https://github.com/rust-lang/rust/issues/53081" target="_blank" title="https://github.com/rust-lang/rust/issues/53081">#53081</a></p>



<a name="180719597"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719597" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719597">(Nov 14 2019 at 10:55)</a>:</h4>
<p>only other nomination is "Some features can no longer be controlled by conditional compilation" <a href="https://github.com/rust-lang/rust/issues/65860" target="_blank" title="https://github.com/rust-lang/rust/issues/65860">#65860</a> ... which I think we discussed last week ... lets see ...</p>



<a name="180719626"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719626" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719626">(Nov 14 2019 at 10:55)</a>:</h4>
<p>I need to get back to that</p>



<a name="180719674"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719674" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719674">(Nov 14 2019 at 10:56)</a>:</h4>
<p>ah right, we <a href="https://zulip-archive.rust-lang.org/131828tcompiler/04503weeklymeeting2019110754818.html#180145391" target="_blank" title="https://zulip-archive.rust-lang.org/131828tcompiler/04503weeklymeeting2019110754818.html#180145391">touched on it</a></p>



<a name="180719676"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719676" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719676">(Nov 14 2019 at 10:56)</a>:</h4>
<p>crater results are clearly favourable</p>



<a name="180719698"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719698" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719698">(Nov 14 2019 at 10:56)</a>:</h4>
<p>we then discussed it at t-lang</p>



<a name="180719699"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719699" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719699">(Nov 14 2019 at 10:56)</a>:</h4>
<p>I think the general feeling was that the triage meeting was not going to be the right place to discuss the question about the overall approach</p>



<a name="180719728"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719728" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719728">(Nov 14 2019 at 10:57)</a>:</h4>
<p>right; let me find the link to those notes from T-lang meeting</p>



<a name="180719783"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719783" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719783">(Nov 14 2019 at 10:58)</a>:</h4>
<p>I see <a href="https://github.com/rust-lang/lang-team/blob/master/minutes/2019-11-07.md#discussion-from-pre-triage-" target="_blank" title="https://github.com/rust-lang/lang-team/blob/master/minutes/2019-11-07.md#discussion-from-pre-triage-">this</a></p>



<a name="180719838"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719838" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719838">(Nov 14 2019 at 10:58)</a>:</h4>
<p>I definitely don't think that comment reflects the actual discussion in the lang meeting</p>



<a name="180719858"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719858" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719858">(Nov 14 2019 at 10:59)</a>:</h4>
<p>the lang meetings themselves are videotaped</p>



<a name="180719871"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719871" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719871">(Nov 14 2019 at 10:59)</a>:</h4>
<p>not the pre-triage <span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span></p>



<a name="180719874"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719874" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719874">(Nov 14 2019 at 10:59)</a>:</h4>
<p>was this only discussed during T-lang pre-triage</p>



<a name="180719877"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719877" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719877">(Nov 14 2019 at 10:59)</a>:</h4>
<p>yeah okay that's what I figured</p>



<a name="180719895"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719895" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719895">(Nov 14 2019 at 10:59)</a>:</h4>
<p>(helps explain why I don't remember discussion)</p>



<a name="180719959"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719959" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719959">(Nov 14 2019 at 11:00)</a>:</h4>
<p>So I can maybe find the time to send some PRs (tho it's also not a requirement imo, and we've made things into hard errors with way more regressions than that, NLL errors in particular).<br>
Beyond that, I think the PR should be re-reverted at least for the gates which had zero regressions. If someone wants to to propose something special about <code>{</code> and <code>}</code> then that is a language feature request and should go through an RFC</p>



<a name="180719986"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180719986" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180719986">(Nov 14 2019 at 11:00)</a>:</h4>
<p>I don't like the idea of using NLL as precedent here.</p>



<a name="180720005"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720005" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720005">(Nov 14 2019 at 11:01)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> there are many other cases <span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span></p>



<a name="180720048"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720048" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720048">(Nov 14 2019 at 11:01)</a>:</h4>
<p>anyway, the main thing to resolve right now is: Should this remain on the nominated items for T-compiler?</p>



<a name="180720100"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720100" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720100">(Nov 14 2019 at 11:02)</a>:</h4>
<p>or should it be shifted to T-lang? Or moved to async discussion?</p>



<a name="180720110"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720110" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720110">(Nov 14 2019 at 11:02)</a>:</h4>
<p>I'm not sure</p>



<a name="180720125"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720125" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720125">(Nov 14 2019 at 11:02)</a>:</h4>
<p>okay. I'll leave it nominated.</p>



<a name="180720155"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720155" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720155">(Nov 14 2019 at 11:02)</a>:</h4>
<p>(And will try harder to extract an answer to that Q at today's meeting.)</p>



<a name="180720170"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720170" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720170">(Nov 14 2019 at 11:03)</a>:</h4>
<p>I had meant to leave a comment but didn't find the time</p>



<a name="180720275"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720275" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720275">(Nov 14 2019 at 11:04)</a>:</h4>
<p>Alright. For the first time I think in three weeks, I've gotten to the P-high traversal with, I hope, <em>plenty</em> of time to actually do the traversal.</p>



<a name="180720356"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720356" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720356">(Nov 14 2019 at 11:05)</a>:</h4>
<p>lets traverse by <a href="https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+sort%3Aupdated-asc" target="_blank" title="https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+sort%3Aupdated-asc">LRU order</a> today.</p>



<a name="180720480"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720480" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720480">(Nov 14 2019 at 11:07)</a>:</h4>
<p>P-high 1/36: "1.30 -&gt; 1.31 dylib late-binding regression with GNU binutils 2.28 or older." <a href="https://github.com/rust-lang/rust/issues/61539" target="_blank" title="https://github.com/rust-lang/rust/issues/61539">#61539</a></p>



<a name="180720598"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720598" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720598">(Nov 14 2019 at 11:08)</a>:</h4>
<p>I'll leave some comments</p>



<a name="180720638"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720638" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720638">(Nov 14 2019 at 11:09)</a>:</h4>
<p>(its essentially my bug, since I'm the one who's keeping it alive [versus just saying "distributions+people need to upgrade their version of <code>binutils</code>]. I'm debating about whether I should just downgrade to P-medium to reflect the reality of what severity we are treating this with ... )</p>



<a name="180720803"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720803" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720803">(Nov 14 2019 at 11:11)</a>:</h4>
<p>P-high 2/36: "Rustc does display a correct error message on type missmatch but does not show line numbers <a href="https://github.com/rust-lang/rust/issues/51635" target="_blank" title="https://github.com/rust-lang/rust/issues/51635">#51635</a></p>



<a name="180720996"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180720996" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180720996">(Nov 14 2019 at 11:14)</a>:</h4>
<p>still needs a more minimal MCVE (at least, I'd prefer one that replaces the use of <code>rocket</code> with a minimal proc-macro definition...)</p>



<a name="180721585"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180721585" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180721585">(Nov 14 2019 at 11:22)</a>:</h4>
<p>P-high 3/36: "Compiler crash on associated type violating its bounds in a blanket impl" <a href="https://github.com/rust-lang/rust/issues/54108" target="_blank" title="https://github.com/rust-lang/rust/issues/54108">#54108</a></p>



<a name="180721610"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180721610" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180721610">(Nov 14 2019 at 11:23)</a>:</h4>
<p>downgrading to P-medium (see discussion on ticket)</p>



<a name="180721693"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180721693" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180721693">(Nov 14 2019 at 11:24)</a>:</h4>
<p>P-high 4/36: "ICE when using anonymization in impl Trait with HRTB" <a href="https://github.com/rust-lang/rust/issues/54895" target="_blank" title="https://github.com/rust-lang/rust/issues/54895">#54895</a></p>



<a name="180721939"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180721939" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180721939">(Nov 14 2019 at 11:28)</a>:</h4>
<p>left comment on ticket and self-assigning.</p>



<a name="180721960"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180721960" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180721960">(Nov 14 2019 at 11:29)</a>:</h4>
<p>P-high 5/36: "ICE in macro: doc meta with expr on an item, string concat, stringify!(...)" <a href="https://github.com/rust-lang/rust/issues/55414" target="_blank" title="https://github.com/rust-lang/rust/issues/55414">#55414</a></p>



<a name="180722409"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180722409" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180722409">(Nov 14 2019 at 11:36)</a>:</h4>
<p>left a comment. This looks like it might be "easy" to resolve. Or maybe adding the desired visit method might cause regressions elsewhere: one might need to audit the existing Visitors to figure out whether the put back in the noop <code>visit_token</code>  ; I imagine that audit is the hardest part of that fix, and probably the reason no one has taken this up yet.</p>



<a name="180722419"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180722419" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180722419">(Nov 14 2019 at 11:37)</a>:</h4>
<p>P-high 6/36: "ICE: Generic type alias to invalid type crashes during type check on latest stable" <a href="https://github.com/rust-lang/rust/issues/62742" target="_blank" title="https://github.com/rust-lang/rust/issues/62742">#62742</a></p>



<a name="180722453"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180722453" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180722453">(Nov 14 2019 at 11:37)</a>:</h4>
<p>(niko has been looking at this, and posted a comment back on October 9th. It seems like its getting the attention it deserves, in the literal sense...)</p>



<a name="180722499"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180722499" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180722499">(Nov 14 2019 at 11:38)</a>:</h4>
<p>P-high 7/36: "ICE resolving non-existent PartialEq::Eq from match of const" <a href="https://github.com/rust-lang/rust/issues/65466" target="_blank" title="https://github.com/rust-lang/rust/issues/65466">#65466</a></p>



<a name="180722541"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180722541" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180722541">(Nov 14 2019 at 11:39)</a>:</h4>
<p>I should at least check if my PR <a href="https://github.com/rust-lang/rust/issues/66120" target="_blank" title="https://github.com/rust-lang/rust/issues/66120">#66120</a> changes behavior here</p>



<a name="180722555"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180722555" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180722555">(Nov 14 2019 at 11:39)</a>:</h4>
<p>(a PR that I need to come back to...)</p>



<a name="180722624"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180722624" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180722624">(Nov 14 2019 at 11:40)</a>:</h4>
<p>P-high 8/36: "internal compiler error: src/librustc/dep_graph/graph.rs:688: DepNode Hir(...) should have been pre-allocated but wasn't." <a href="https://github.com/rust-lang/rust/issues/62649" target="_blank" title="https://github.com/rust-lang/rust/issues/62649">#62649</a></p>



<a name="180722740"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180722740" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180722740">(Nov 14 2019 at 11:42)</a>:</h4>
<p>(while looking at this, decided to close <a href="https://github.com/rust-lang/rust/issues/66187" target="_blank" title="https://github.com/rust-lang/rust/issues/66187">#66187</a> as duplicate)</p>



<a name="180722985"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180722985" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180722985">(Nov 14 2019 at 11:47)</a>:</h4>
<p>(while looking at this, decided to close <a href="https://github.com/rust-lang/rust/issues/63150" target="_blank" title="https://github.com/rust-lang/rust/issues/63150">#63150</a>  as non-actionable without info about the delta that caused  incr compilation to fail)</p>



<a name="180723206"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180723206" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180723206">(Nov 14 2019 at 11:50)</a>:</h4>
<p>left comment on <a href="https://github.com/rust-lang/rust/issues/62649" target="_blank" title="https://github.com/rust-lang/rust/issues/62649">#62649</a></p>



<a name="180723231"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180723231" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180723231">(Nov 14 2019 at 11:51)</a>:</h4>
<p>P-high 9/36 (or 34 now?): "ICE from const item in lifetime-parametric impl" <a href="https://github.com/rust-lang/rust/issues/56445" target="_blank" title="https://github.com/rust-lang/rust/issues/56445">#56445</a></p>



<a name="180723297"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180723297" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180723297">(Nov 14 2019 at 11:52)</a>:</h4>
<p>interesting comment there from github user PlasmaPower</p>



<a name="180723619"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180723619" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180723619">(Nov 14 2019 at 11:58)</a>:</h4>
<p>hmm. Tracking issue for const generics (<a href="https://github.com/rust-lang/rust/issues/44580" target="_blank" title="https://github.com/rust-lang/rust/issues/44580">#44580</a>) has been locked</p>



<a name="180723806"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180723806" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180723806">(Nov 14 2019 at 12:01)</a>:</h4>
<p>(because there some vigorous discussion of syntactic alternatives on the thread, and people (rightly) pointed out that the tracking issue is not the right place for such discussion.)</p>



<a name="180723924"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180723924" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180723924">(Nov 14 2019 at 12:03)</a>:</h4>
<p>anyway I don't think there's anything to report here</p>



<a name="180723930"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180723930" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180723930">(Nov 14 2019 at 12:03)</a>:</h4>
<p>main question is whether it should remain P-high ...</p>



<a name="180723965"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180723965" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180723965">(Nov 14 2019 at 12:04)</a>:</h4>
<p>maybe we can prioritize figuring out a way to provide a better error message here?</p>



<a name="180724422"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724422" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724422">(Nov 14 2019 at 12:11)</a>:</h4>
<p>anyway left comment saying that.</p>



<a name="180724476"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724476" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724476">(Nov 14 2019 at 12:12)</a>:</h4>
<p>(and closed another issue I found as a duplicate of this one)</p>



<a name="180724495"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724495" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724495">(Nov 14 2019 at 12:12)</a>:</h4>
<p>P-high 10/34: "debuginfo/pretty-uninitialized-vec fails with <code>Cannot access memory at address 0x7fffff7fe000</code>" <a href="https://github.com/rust-lang/rust/issues/64343" target="_blank" title="https://github.com/rust-lang/rust/issues/64343">#64343</a></p>



<a name="180724520"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724520" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724520">(Nov 14 2019 at 12:13)</a>:</h4>
<p>hey <span class="user-mention" data-user-id="126931">@centril</span> , did T-release end up just marking the debuginfo test here as <code>// ignore</code> ?</p>



<a name="180724537"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724537" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724537">(Nov 14 2019 at 12:13)</a>:</h4>
<p>havent had time yet</p>



<a name="180724542"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724542" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724542">(Nov 14 2019 at 12:13)</a>:</h4>
<p>okay just curious</p>



<a name="180724551"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724551" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724551">(Nov 14 2019 at 12:13)</a>:</h4>
<p>you can assign to me to do that</p>



<a name="180724606"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724606" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724606">(Nov 14 2019 at 12:14)</a>:</h4>
<p>okay I'll add you as assignee list</p>



<a name="180724654"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724654" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724654">(Nov 14 2019 at 12:15)</a>:</h4>
<p>(but if you do add the <code>// ignore</code>, I'm not sure the answer would be to close this bug. Probably better to just downgrade it to P-medium after the test is ignored ...?)</p>



<a name="180724665"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724665" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724665">(Nov 14 2019 at 12:15)</a>:</h4>
<p>yea</p>



<a name="180724794"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724794" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724794">(Nov 14 2019 at 12:17)</a>:</h4>
<p>P-high 11/34: "Rustc panics (NoSolution): could not prove Binder(projection soup)" <a href="https://github.com/rust-lang/rust/issues/65581" target="_blank" title="https://github.com/rust-lang/rust/issues/65581">#65581</a></p>



<a name="180724921"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724921" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724921">(Nov 14 2019 at 12:18)</a>:</h4>
<p>hmm. Should be investigated, but hasn't been since I marked it P-high 3 weeks ago.</p>



<a name="180724936"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180724936" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180724936">(Nov 14 2019 at 12:19)</a>:</h4>
<p>I'll post it in the main meeting area as a request for help</p>



<a name="180725043"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180725043" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180725043">(Nov 14 2019 at 12:20)</a>:</h4>
<p>P-high 12/34: "Coherence can be bypassed by an indirect impl for a trait object" <a href="https://github.com/rust-lang/rust/issues/57893" target="_blank" title="https://github.com/rust-lang/rust/issues/57893">#57893</a></p>



<a name="180725070"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180725070" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180725070">(Nov 14 2019 at 12:21)</a>:</h4>
<p>niko and others have been looking at this, as you can see from comments in issue</p>



<a name="180725083"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180725083" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180725083">(Nov 14 2019 at 12:21)</a>:</h4>
<p>has hypothetical fix put up for crater run in PR <a href="https://github.com/rust-lang/rust/issues/66037" target="_blank" title="https://github.com/rust-lang/rust/issues/66037">#66037</a></p>



<a name="180725102"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180725102" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180725102">(Nov 14 2019 at 12:21)</a>:</h4>
<p>so, things are actually progressing well there</p>



<a name="180725157"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180725157" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180725157">(Nov 14 2019 at 12:22)</a>:</h4>
<p>P-high 13/34: "ICE: errors resolving bounds after type-checking for fmt::Display" <a href="https://github.com/rust-lang/rust/issues/65774" target="_blank" title="https://github.com/rust-lang/rust/issues/65774">#65774</a></p>



<a name="180725528"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180725528" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180725528">(Nov 14 2019 at 12:27)</a>:</h4>
<p>some weeks ago I started a blog post on semi-mechanical techniques for turning code into an MCVE</p>



<a name="180725529"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180725529" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180725529">(Nov 14 2019 at 12:27)</a>:</h4>
<p>I really need to finish it</p>



<a name="180725609"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180725609" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180725609">(Nov 14 2019 at 12:28)</a>:</h4>
<p>(I think a significant number of people fail to provide an MCVE because they try to start small and build up -- but cannot find the path to the destination -- rather than starting from the original and cutting it down.)</p>



<a name="180726554"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180726554" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180726554">(Nov 14 2019 at 12:42)</a>:</h4>
<p>anyway, looked a bit at <a href="https://github.com/rust-lang/rust/issues/65774" target="_blank" title="https://github.com/rust-lang/rust/issues/65774">#65774</a>. Couldn't reproduce (built accessifully, at least with certain flags that reflected those given in bug description.) Closing as non-reproducible (left more details in my comment on ticket).</p>



<a name="180726570"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180726570" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180726570">(Nov 14 2019 at 12:42)</a>:</h4>
<p>P-high 14/34: "Rust 1.38 regressions weren't fully triaged" <a href="https://github.com/rust-lang/rust/issues/65577" target="_blank" title="https://github.com/rust-lang/rust/issues/65577">#65577</a></p>



<a name="180726589"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180726589" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180726589">(Nov 14 2019 at 12:42)</a>:</h4>
<p>hmm no one has been assigned to do the actual triage here.</p>



<a name="180726712"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180726712" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180726712">(Nov 14 2019 at 12:44)</a>:</h4>
<p>left comment in main meeting area</p>



<a name="180726714"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180726714" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180726714">(Nov 14 2019 at 12:44)</a>:</h4>
<p>most of these are due to NLL stuff</p>



<a name="180726721"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180726721" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180726721">(Nov 14 2019 at 12:44)</a>:</h4>
<p>P-high 15/34: "LLVM ERROR: Access past stack top!" when compiling without sse2" <a href="https://github.com/rust-lang/rust/issues/65844" target="_blank" title="https://github.com/rust-lang/rust/issues/65844">#65844</a></p>



<a name="180726797"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180726797" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180726797">(Nov 14 2019 at 12:45)</a>:</h4>
<p><span class="user-mention" data-user-id="126931">@centril</span> the NLL stuff are the cases that <span class="user-mention" data-user-id="116118">@Matthew Jasper</span> already triaged, right? The remaining work is five cases that are not related to NLL (or at least not obviously related)</p>



<a name="180726812"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180726812" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180726812">(Nov 14 2019 at 12:45)</a>:</h4>
<p>seems right yeah</p>



<a name="180726908"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180726908" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180726908">(Nov 14 2019 at 12:46)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/65844" target="_blank" title="https://github.com/rust-lang/rust/issues/65844">#65844</a> was advertised to LLVM ice breakers and we did get some info from comments on it</p>



<a name="180727316"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727316" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727316">(Nov 14 2019 at 12:53)</a>:</h4>
<p>and, oooh boy, I get a spurious segfault directly from my own <code>rustc +nightly-2019-10-24</code> on it</p>



<a name="180727423"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727423" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727423">(Nov 14 2019 at 12:54)</a>:</h4>
<p>(assigned self for further investigation)</p>



<a name="180727443"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727443" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727443">(Nov 14 2019 at 12:55)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> have I mentioned you self-assign too much? :D</p>



<a name="180727452"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727452" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727452">(Nov 14 2019 at 12:55)</a>:</h4>
<p>yep</p>



<a name="180727455"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727455" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727455">(Nov 14 2019 at 12:55)</a>:</h4>
<p>or rather</p>



<a name="180727459"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727459" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727459">(Nov 14 2019 at 12:55)</a>:</h4>
<p>I agree, and I'm trying to not do it so much</p>



<a name="180727464"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727464" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727464">(Nov 14 2019 at 12:55)</a>:</h4>
<p>we should try it with an alt build</p>



<a name="180727469"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727469" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727469">(Nov 14 2019 at 12:55)</a>:</h4>
<p>what's an alt build?</p>



<a name="180727528"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727528" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727528">(Nov 14 2019 at 12:56)</a>:</h4>
<blockquote>
<p>I agree, and I'm trying to not do it so much</p>
</blockquote>
<p>(thus the <span aria-label="construction worker" class="emoji emoji-1f477" role="img" title="construction worker">:construction_worker:</span> 's in the main meeting area)</p>



<a name="180727564"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727564" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727564">(Nov 14 2019 at 12:57)</a>:</h4>
<p>P-high 16/34: "ICE with impl Fn alias." <a href="https://github.com/rust-lang/rust/issues/65918" target="_blank" title="https://github.com/rust-lang/rust/issues/65918">#65918</a></p>



<a name="180727576"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727576" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727576">(Nov 14 2019 at 12:57)</a>:</h4>
<p>has a PR awaiting review in PR <a href="https://github.com/rust-lang/rust/issues/65989" target="_blank" title="https://github.com/rust-lang/rust/issues/65989">#65989</a></p>



<a name="180727588"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727588" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727588">(Nov 14 2019 at 12:58)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> I think we can probably assign everything that is requires-nightly as P-medium max</p>



<a name="180727639"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727639" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727639">(Nov 14 2019 at 12:58)</a>:</h4>
<p>unless it's something we're actively trying to ready for stabilziation</p>



<a name="180727649"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727649" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727649">(Nov 14 2019 at 12:58)</a>:</h4>
<p>well, <em>sometimes</em> they are signs of deeper problems</p>



<a name="180727651"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727651" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727651">(Nov 14 2019 at 12:58)</a>:</h4>
<p>but I generally agree</p>



<a name="180727656"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727656" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727656">(Nov 14 2019 at 12:58)</a>:</h4>
<p>fair point</p>



<a name="180727661"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727661" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727661">(Nov 14 2019 at 12:58)</a>:</h4>
<p>it would be one way to try decrease the load of P-high issues, certainly</p>



<a name="180727684"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727684" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727684">(Nov 14 2019 at 12:59)</a>:</h4>
<p>P-high 17/34: "yet another associated type ICE (probably more missing normalize calls)" <a href="https://github.com/rust-lang/rust/issues/65934" target="_blank" title="https://github.com/rust-lang/rust/issues/65934">#65934</a></p>



<a name="180727691"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727691" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727691">(Nov 14 2019 at 12:59)</a>:</h4>
<p>an alt build has llvm asserts and IR verification</p>



<a name="180727817"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727817" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727817">(Nov 14 2019 at 13:00)</a>:</h4>
<p>do alt builds have the full debug stuff from LLVM? E.g. do lines like  <code>LLVM_DEBUG(dbgs() &lt;&lt; "Ignores Dead GUID: " &lt;&lt; VI &lt;&lt; "\n");</code> do useful stuff on such builds?</p>



<a name="180727856"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727856" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727856">(Nov 14 2019 at 13:01)</a>:</h4>
<p>hm, not sure. Maybe not :)</p>



<a name="180727949"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180727949" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180727949">(Nov 14 2019 at 13:02)</a>:</h4>
<p>Just curious. (I just initiated a local build that hopefully has those bits enabled before starting the triage, as part of investigating a ThinLTO issue; but if I can get support for it from somewhere I can <code>rustup</code> or <code>curl</code>/<code>wget</code>, I would be thrilled...)</p>



<a name="180728028"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180728028" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180728028">(Nov 14 2019 at 13:03)</a>:</h4>
<p>regarding <a href="https://github.com/rust-lang/rust/issues/65934" target="_blank" title="https://github.com/rust-lang/rust/issues/65934">#65934</a>, nothings happened. Not sure how to best handle the set of bugs that all seem to fall under lazy-normalization and/or insufficient-normalization ...</p>



<a name="180728282"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180728282" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180728282">(Nov 14 2019 at 13:06)</a>:</h4>
<p>but it did remind me to look at "Associated types, impl traits ~and closures~; oh my, an ICE." <a href="https://github.com/rust-lang/rust/issues/63154" target="_blank" title="https://github.com/rust-lang/rust/issues/63154">#63154</a> , which I have now closed as fixed.</p>



<a name="180728304"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180728304" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180728304">(Nov 14 2019 at 13:07)</a>:</h4>
<p>(which would have been 18/34)</p>



<a name="180728459"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180728459" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180728459">(Nov 14 2019 at 13:09)</a>:</h4>
<p>P-high 19/34 (or maybe 30, heh): "rust-lld since 1.38 overlaps .text with .rodata for embedded arm target" <a href="https://github.com/rust-lang/rust/issues/65391" target="_blank" title="https://github.com/rust-lang/rust/issues/65391">#65391</a></p>



<a name="180728773"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180728773" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180728773">(Nov 14 2019 at 13:12)</a>:</h4>
<p>left a comment</p>



<a name="180728824"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180728824" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180728824">(Nov 14 2019 at 13:13)</a>:</h4>
<p>P-high 20/30: "Miscompilation with target-cpu=znver1 (AMD Ryzen 1000/2000 series) on Windows + LLVM 9." <a href="https://github.com/rust-lang/rust/issues/63959" target="_blank" title="https://github.com/rust-lang/rust/issues/63959">#63959</a></p>



<a name="180729041"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729041" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729041">(Nov 14 2019 at 13:15)</a>:</h4>
<p>@eddyb's been looking pretty heavily into this, but they also said that they're unlikely to look into it much further, though they are willing to provide support for others who want to</p>



<a name="180729049"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729049" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729049">(Nov 14 2019 at 13:15)</a>:</h4>
<p>I'll post a <span aria-label="construction worker" class="emoji emoji-1f477" role="img" title="construction worker">:construction_worker:</span> in the main meeting area</p>



<a name="180729315"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729315" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729315">(Nov 14 2019 at 13:18)</a>:</h4>
<p>P-high 21/30: "The compiler should report publicly exported type names if possible" <a href="https://github.com/rust-lang/rust/issues/21934" target="_blank" title="https://github.com/rust-lang/rust/issues/21934">#21934</a></p>



<a name="180729340"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729340" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729340">(Nov 14 2019 at 13:18)</a>:</h4>
<p>there's been much recent activity in the comment thread here, including ... &lt;felix squints&gt; ... a Pre-RFC</p>



<a name="180729404"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729404" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729404">(Nov 14 2019 at 13:19)</a>:</h4>
<p>I, like <span class="user-mention" data-user-id="132040">@Manish Goregaokar</span> , don't think an RFC is necessary here. At most a design meeting, I suspect, and even that may be overkill.</p>



<a name="180729414"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729414" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729414">(Nov 14 2019 at 13:19)</a>:</h4>
<p>I'll post a comment to that effect.</p>



<a name="180729635"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729635" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729635">(Nov 14 2019 at 13:22)</a>:</h4>
<p>P-high 22/30: "async fn presence affects an unrelated error message" <a href="https://github.com/rust-lang/rust/issues/66312" target="_blank" title="https://github.com/rust-lang/rust/issues/66312">#66312</a></p>



<a name="180729710"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729710" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729710">(Nov 14 2019 at 13:23)</a>:</h4>
<p>scary scary scary!</p>



<a name="180729720"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729720" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729720">(Nov 14 2019 at 13:23)</a>:</h4>
<p>lets definitely keep our eyes on this one</p>



<a name="180729739"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729739" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729739">(Nov 14 2019 at 13:23)</a>:</h4>
<p>P-high 23/30: "Some features can no longer be controlled by conditional compilation" <a href="https://github.com/rust-lang/rust/issues/65860" target="_blank" title="https://github.com/rust-lang/rust/issues/65860">#65860</a></p>



<a name="180729787"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729787" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729787">(Nov 14 2019 at 13:24)</a>:</h4>
<p>we already touched on this up above. I'll make a note of it in the main mtg channel so people have time to prep if they're following there right now</p>



<a name="180729986"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180729986" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180729986">(Nov 14 2019 at 13:26)</a>:</h4>
<p>P-high 24/30: " Incremental compilation results in linker error when method use is removed" <a href="https://github.com/rust-lang/rust/issues/59535" target="_blank" title="https://github.com/rust-lang/rust/issues/59535">#59535</a></p>



<a name="180730011"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730011" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730011">(Nov 14 2019 at 13:27)</a>:</h4>
<p>all I can say is that I've been working my butt off trying to 1. reduce and 2. understand this bug. It arises due to a nasty confluence of features.</p>



<a name="180730034"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730034" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730034">(Nov 14 2019 at 13:27)</a>:</h4>
<p>but its as "in hand" as it can be...</p>



<a name="180730047"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730047" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730047">(Nov 14 2019 at 13:27)</a>:</h4>
<p>P-high 25/30: "ICE when using reference variable from iterator (instead of copying it): thread 'rustc' panicked at 'already borrowed: BorrowMutError'" <a href="https://github.com/rust-lang/rust/issues/66353" target="_blank" title="https://github.com/rust-lang/rust/issues/66353">#66353</a></p>



<a name="180730162"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730162" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730162">(Nov 14 2019 at 13:29)</a>:</h4>
<p>(we touched on this briefly up above. The ICE itself is being papered-over via a <code>delay_span_bug</code> in PR <a href="https://github.com/rust-lang/rust/issues/66388" target="_blank" title="https://github.com/rust-lang/rust/issues/66388">#66388</a>. I am still musing about whether we should have a stack-trace-capturing DebugRefCell to provide more context when things like this arise ...)</p>



<a name="180730167"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730167" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730167">(Nov 14 2019 at 13:29)</a>:</h4>
<p>in any case, it seems like it is in hand for now</p>



<a name="180730241"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730241" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730241">(Nov 14 2019 at 13:30)</a>:</h4>
<p>P-high 26/30: "Spurious x86_64 Windows CI failures due to OOM" <a href="https://github.com/rust-lang/rust/issues/66342" target="_blank" title="https://github.com/rust-lang/rust/issues/66342">#66342</a></p>



<a name="180730266"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730266" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730266">(Nov 14 2019 at 13:31)</a>:</h4>
<p>(we covered this already  when I went over the nominations; it has a PR)</p>



<a name="180730397"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730397" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730397">(Nov 14 2019 at 13:32)</a>:</h4>
<p>same for "thread 'rustc' panicked at 'called <code>Option::unwrap()</code> on a <code>None</code> value'" <a href="https://github.com/rust-lang/rust/issues/66286" target="_blank" title="https://github.com/rust-lang/rust/issues/66286">#66286</a></p>



<a name="180730445"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730445" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730445">(Nov 14 2019 at 13:33)</a>:</h4>
<p>yeah all the rest we've already covered, I think</p>



<a name="180730559"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730559" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730559">(Nov 14 2019 at 13:34)</a>:</h4>
<p>gonna go over the beta-nominations and make sure all relevant ones have T-compiler label too</p>



<a name="180730585"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730585" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730585">(Nov 14 2019 at 13:35)</a>:</h4>
<p>I forget to add T-compiler to PR <a href="https://github.com/rust-lang/rust/issues/66394" target="_blank" title="https://github.com/rust-lang/rust/issues/66394">#66394</a> before; fixed now</p>



<a name="180730613"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730613" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730613">(Nov 14 2019 at 13:35)</a>:</h4>
<p>added T-compiler to "Fix ICE when trying to suggest <code>Type&lt;&gt;</code> instead of <code>Type()</code> <a href="https://github.com/rust-lang/rust/issues/66390" target="_blank" title="https://github.com/rust-lang/rust/issues/66390">#66390</a>  too</p>



<a name="180730715"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730715" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730715">(Nov 14 2019 at 13:36)</a>:</h4>
<p>added T-compiler to "find_deprecation: deprecation attr may be ill-formed meta." <a href="https://github.com/rust-lang/rust/issues/66381" target="_blank" title="https://github.com/rust-lang/rust/issues/66381">#66381</a></p>



<a name="180730780"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730780" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730780">(Nov 14 2019 at 13:37)</a>:</h4>
<p>added T-compiler to "parser: don't use <code>unreachable!()</code> in <code>fn unexpected</code>." <a href="https://github.com/rust-lang/rust/issues/66361" target="_blank" title="https://github.com/rust-lang/rust/issues/66361">#66361</a></p>



<a name="180730800"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730800" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730800">(Nov 14 2019 at 13:37)</a>:</h4>
<p>added T-compiler to "Undo an assert causing an ICE until we fix the underlying problem" <a href="https://github.com/rust-lang/rust/issues/66250" target="_blank" title="https://github.com/rust-lang/rust/issues/66250">#66250</a></p>



<a name="180730858"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180730858" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180730858">(Nov 14 2019 at 13:38)</a>:</h4>
<p>wow that means we have 7 beta-nominations to get through today</p>



<a name="180731110"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180731110" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180731110">(Nov 14 2019 at 13:41)</a>:</h4>
<p>but "only" <a href="https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3AI-nominated+label%3AT-compiler" target="_blank" title="https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3AI-nominated+label%3AT-compiler">five nominations</a>, so I guess that balances out</p>



<a name="180731479"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180731479" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180731479">(Nov 14 2019 at 13:46)</a>:</h4>
<blockquote>
<p>an alt build has llvm asserts and IR verification</p>
</blockquote>
<p><span class="user-mention" data-user-id="116122">@simulacrum</span> are the alt builds made in parallel with the nightlies? In other words: Can I grab them via <code>rustup</code> ?</p>



<a name="180731537"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180731537" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180731537">(Nov 14 2019 at 13:46)</a>:</h4>
<p>hm.. not sure about rustup</p>



<a name="180731538"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180731538" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180731538">(Nov 14 2019 at 13:46)</a>:</h4>
<p>rustup-toolchain-install-master can do it</p>



<a name="180731543"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180731543" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180731543">(Nov 14 2019 at 13:46)</a>:</h4>
<p>(I skimmed rust-forge to see if the answer is there, but did not see anything about at builds there)</p>



<a name="180731559"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180731559" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180731559">(Nov 14 2019 at 13:46)</a>:</h4>
<p>we produce them for every commit, though</p>



<a name="180731566"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180731566" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180731566">(Nov 14 2019 at 13:46)</a>:</h4>
<p>ah sweeeeeet</p>



<a name="180731575"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180731575" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180731575">(Nov 14 2019 at 13:46)</a>:</h4>
<p>these days they're also parallel compilers</p>



<a name="180731586"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180731586" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180731586">(Nov 14 2019 at 13:47)</a>:</h4>
<p>but the default is -Zthreads=1 so that shouldn't affect much other than performance</p>



<a name="180731618"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180731618" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180731618">(Nov 14 2019 at 13:47)</a>:</h4>
<p>(as in, you get the overhead drawback but no parallelization benefit by default, right?)</p>



<a name="180731635"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180731635" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180731635">(Nov 14 2019 at 13:47)</a>:</h4>
<p>yep</p>



<a name="180732777"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180732777" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180732777">(Nov 14 2019 at 13:59)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> oops my bad; forgot to label those</p>



<a name="180732957"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180732957" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180732957">(Nov 14 2019 at 14:00)</a>:</h4>
<blockquote>
<p>I'm musing about a debugging variant of <code>RefCell</code> that stored a stack-trace on each borrow, so that a <code>borrow_mut</code> failure could actually print a stack trace</p>
</blockquote>
<p>can't wait to land <span class="user-mention" data-user-id="130111">@anp</span>'s <code>#[track_caller]</code> implementation, then we can store at the very least a single <code>&amp;'static Location</code>, which is just one pointer of overhead, might be fine to just enable it on all debug-assertions builds of rustc</p>
<p>(it's no backtrace but far more useful than RefCell methods panicking)</p>



<a name="180733549"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180733549" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180733549">(Nov 14 2019 at 14:07)</a>:</h4>
<blockquote>
<p>hmm. Tracking issue for const generics (<a href="https://github.com/rust-lang/rust/issues/44580" target="_blank" title="https://github.com/rust-lang/rust/issues/44580">#44580</a>) has been locked</p>
</blockquote>
<p>oops I meant to go through and mark most comments as offtopic, maybe I should do that now :P</p>



<a name="180733709"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180733709" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180733709">(Nov 14 2019 at 14:09)</a>:</h4>
<p>it can stay locked I think</p>



<a name="180733712"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180733712" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180733712">(Nov 14 2019 at 14:09)</a>:</h4>
<p>people should file bugs via issues</p>



<a name="180734195"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734195" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734195">(Nov 14 2019 at 14:15)</a>:</h4>
<p>oh yeah I just wanted to make sure the offtopic discussion wasn't in everyone's faces - <span class="user-mention" data-user-id="121053">@varkor</span>'s update comment is what people should see :)</p>



<a name="180734411"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734411" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734411">(Nov 14 2019 at 14:18)</a>:</h4>
<blockquote>
<p>(I think a significant number of people fail to provide an MCVE because they try to start small and build up -- but cannot find the path to the destination -- rather than starting from the original and cutting it down.)</p>
</blockquote>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> I'm not even sure what "MCVE" stands for. I always prefer to talk about "reducing" and "reduction" because it's clear that you chip away at something large (heh it's kinda like subtractive manufacturing i.e. machining away material)</p>
<p>and reduction techniques are fun, like getting rid of function bodies, replacing them with <code>loop {}</code> or even using <code>black_box</code> (in case weird optimization bugs are involved), so  big <span aria-label="+1" class="emoji emoji-1f44d" role="img" title="+1">:+1:</span> on teaching more people about them</p>



<a name="180734503"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734503" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734503">(Nov 14 2019 at 14:20)</a>:</h4>
<p>but also there are rare cases when building something up <em>does</em> work, it just requires already having a mental model for why the problem happened -  like building a stress test by using macros to generate a lot of the one thing you're pretty sure is inefficient (or specifically causes quadratic or worse behavior)</p>



<a name="180734563"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734563" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734563">(Nov 14 2019 at 14:20)</a>:</h4>
<p>Of course building up can work</p>



<a name="180734580"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734580" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734580">(Nov 14 2019 at 14:20)</a>:</h4>
<p>But my point was that I’ve seen people give up after it falls</p>



<a name="180734589"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734589" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734589">(Nov 14 2019 at 14:20)</a>:</h4>
<p>(but I'm preaching to the choir here unless other people see what I wrote lol)</p>



<a name="180734636"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734636" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734636">(Nov 14 2019 at 14:21)</a>:</h4>
<p>Well maybe I’ll finish up my desired blog post and then Let you suggest additions. :)</p>



<a name="180734642"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734642" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734642">(Nov 14 2019 at 14:21)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> yeah I think I'd tell them not to bother with de-novo reproduction unless they've already done a reduction. and maybe we can rename E-needs-mcve? unless MCVE is an industry standard term and I'm just out of touch :P</p>



<a name="180734703"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734703" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734703">(Nov 14 2019 at 14:22)</a>:</h4>
<p>oh I expect the blog post is good already, just hyping myself for it</p>



<a name="180734707"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734707" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734707">(Nov 14 2019 at 14:22)</a>:</h4>
<p>I had to google it myself</p>



<a name="180734722"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734722" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734722">(Nov 14 2019 at 14:22)</a>:</h4>
<p>wait so who created the label?!</p>



<a name="180734738"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734738" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734738">(Nov 14 2019 at 14:22)</a>:</h4>
<p>(MCVE); but I *know * I’m out of touch</p>



<a name="180734760"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734760" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734760">(Nov 14 2019 at 14:22)</a>:</h4>
<p>(kinda crazy how things happen nowadays and I have no idea when or where they did, just see the aftermath)</p>



<a name="180734777"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734777" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734777">(Nov 14 2019 at 14:23)</a>:</h4>
<p>It is relatively google-able though</p>



<a name="180734789"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734789" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734789">(Nov 14 2019 at 14:23)</a>:</h4>
<p>Compared to say “minimize” or “reduction”</p>



<a name="180734812"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734812" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734812">(Nov 14 2019 at 14:23)</a>:</h4>
<p>In terms of getting the right thing in the top ... three hits</p>



<a name="180734825"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734825" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734825">(Nov 14 2019 at 14:23)</a>:</h4>
<p>LOL <a href="https://en.wikipedia.org/wiki/MCVE" target="_blank" title="https://en.wikipedia.org/wiki/MCVE">https://en.wikipedia.org/wiki/MCVE</a></p>



<a name="180734873"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734873" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734873">(Nov 14 2019 at 14:24)</a>:</h4>
<p>I love how wikipedia links to SO</p>



<a name="180734976"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734976" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734976">(Nov 14 2019 at 14:25)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> uhhhh this puts the less effective approach first <a href="https://stackoverflow.com/help/minimal-reproducible-example" target="_blank" title="https://stackoverflow.com/help/minimal-reproducible-example">https://stackoverflow.com/help/minimal-reproducible-example</a></p>



<a name="180734996"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180734996" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180734996">(Nov 14 2019 at 14:25)</a>:</h4>
<p>maybe it works for things that aren't compiler bugs :P?</p>



<a name="180735075"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180735075" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180735075">(Nov 14 2019 at 14:26)</a>:</h4>
<p>To be fair, I didn’t say you shouldn’t build up at all, or that you shouldn’t try it first</p>



<a name="180735080"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180735080" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180735080">(Nov 14 2019 at 14:26)</a>:</h4>
<p>I think we <em>all</em> try it first</p>



<a name="180735091"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180735091" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180735091">(Nov 14 2019 at 14:26)</a>:</h4>
<p>but okay I won't argue with googleability metrics - I still think we should use "reduction" or "reduced" if we actually leave a comment (maybe we should have a bot that links your blog post :P)</p>



<a name="180735132"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180735132" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180735132">(Nov 14 2019 at 14:27)</a>:</h4>
<p>Let’s finish the post before the bot. ;)</p>



<a name="180735179"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180735179" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180735179">(Nov 14 2019 at 14:27)</a>:</h4>
<p>tick <span aria-label="clock" class="emoji emoji-1f557" role="img" title="clock">:clock:</span> tock <span aria-label="clock" class="emoji emoji-1f557" role="img" title="clock">:clock:</span> :)</p>



<a name="180735231"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180735231" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180735231">(Nov 14 2019 at 14:27)</a>:</h4>
<p>Just call me Adrian Veidt</p>



<a name="180735664"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180735664" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180735664">(Nov 14 2019 at 14:33)</a>:</h4>
<blockquote>
<p>I think we <em>all</em> try it first</p>
</blockquote>
<p>not in my most recent couple of reductions, but maybe that's just because all I had were large amounts of code and a somewhat opaque predicate for "does this cause the problem"</p>



<a name="180735944"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180735944" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180735944">(Nov 14 2019 at 14:36)</a>:</h4>
<p>have you seen my <a href="https://github.com/rust-lang/rust/issues/59535#issuecomment-551600222" target="_blank" title="https://github.com/rust-lang/rust/issues/59535#issuecomment-551600222">mind-bending reduction</a> for <a href="https://github.com/rust-lang/rust/issues/59535" target="_blank" title="https://github.com/rust-lang/rust/issues/59535">#59535</a></p>



<a name="180735983"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180735983" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180735983">(Nov 14 2019 at 14:37)</a>:</h4>
<p>I can only imagine how those <code>impl R {}</code> blocks are influencing ThinLTO</p>



<a name="180736003"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736003" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736003">(Nov 14 2019 at 14:37)</a>:</h4>
<p>the hell</p>



<a name="180736082"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736082" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736082">(Nov 14 2019 at 14:38)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> one explanation is you're injecting symbol name <em>length</em> variation</p>



<a name="180736092"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736092" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736092">(Nov 14 2019 at 14:38)</a>:</h4>
<p>have you tried varying some of the names involved?</p>



<a name="180736102"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736102" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736102">(Nov 14 2019 at 14:38)</a>:</h4>
<p>yeah alpha-renaming stuff also can cause the bug to go away</p>



<a name="180736105"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736105" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736105">(Nov 14 2019 at 14:38)</a>:</h4>
<p>so its certainly a factor</p>



<a name="180736134"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736134" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736134">(Nov 14 2019 at 14:38)</a>:</h4>
<p>okay have you tried uhhh removing several hundred impls and adding one character to a name?</p>



<a name="180736164"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736164" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736164">(Nov 14 2019 at 14:39)</a>:</h4>
<p>effectively treating the log10 of the number of impls as a parameter</p>



<a name="180736180"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736180" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736180">(Nov 14 2019 at 14:39)</a>:</h4>
<p>(I wish I never had to say those words)</p>



<a name="180736194"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736194" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736194">(Nov 14 2019 at 14:39)</a>:</h4>
<p>I suppose that would be one way to try to further reduce those tests</p>



<a name="180736269"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736269" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736269">(Nov 14 2019 at 14:40)</a>:</h4>
<p>but at this point I think I'm better off working within the execution of rustc+LLVM that I can observe</p>



<a name="180736272"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736272" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736272">(Nov 14 2019 at 14:40)</a>:</h4>
<p>the other thing is you might be fudging some partitioning algorithms, worse case being ofc a hash</p>



<a name="180736291"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736291" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736291">(Nov 14 2019 at 14:40)</a>:</h4>
<p>i.e. I now have a pretty strong theory as to what's going wrong</p>



<a name="180736356"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736356" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736356">(Nov 14 2019 at 14:41)</a>:</h4>
<p>(though I'm not yet sure which of LLVM or rustc get the blame for the problem)</p>



<a name="180736360"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736360" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736360">(Nov 14 2019 at 14:41)</a>:</h4>
<p>one thing you could do is script the number of <code>impl R {}</code>s to find other values for which it repros</p>



<a name="180736388"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736388" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736388">(Nov 14 2019 at 14:41)</a>:</h4>
<p>yeah I considering writing a macro to help with such a search</p>



<a name="180736509"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736509" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736509">(Nov 14 2019 at 14:42)</a>:</h4>
<p>i suppose when it comes time to post a regression test as part of a PR, I'll prefer to have a further reduced example in hand . . . so the time doing further reduction wouldn't have been wasted (assuming me or someone else eventually posts a fix)</p>



<a name="180736728"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736728" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736728">(Nov 14 2019 at 14:45)</a>:</h4>
<p>we should do shrinking on ASTs :D</p>



<a name="180736917"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180736917" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180736917">(Nov 14 2019 at 14:47)</a>:</h4>
<p>I think creduce technically supports Rust? I just don't really trust fully automated tools, I'd prefer something I can still guide</p>



<a name="180737023"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737023" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737023">(Nov 14 2019 at 14:48)</a>:</h4>
<p>is that a fuzzer? -- I was thinking using QuickCheck / proptest</p>



<a name="180737051"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737051" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737051">(Nov 14 2019 at 14:49)</a>:</h4>
<p>it's a reducer :P</p>



<a name="180737076"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737076" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737076">(Nov 14 2019 at 14:49)</a>:</h4>
<p>I don't know what a reducer is</p>



<a name="180737101"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737101" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737101">(Nov 14 2019 at 14:49)</a>:</h4>
<p>none of "fuzzers / quickcheck / proptest" do incremental reductions AFAIK</p>



<a name="180737114"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737114" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737114">(Nov 14 2019 at 14:49)</a>:</h4>
<p><span class="user-mention" data-user-id="126931">@centril</span> it reduces an input while keeping a property</p>



<a name="180737184"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737184" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737184">(Nov 14 2019 at 14:50)</a>:</h4>
<p><span class="user-mention" data-user-id="119009">@eddyb</span> that's exactly what shrinking (esp. the ddmin algorithm) is about</p>



<a name="180737194"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737194" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737194">(Nov 14 2019 at 14:50)</a>:</h4>
<p>you said shrinking which could make sense as being the same thing, but... oh</p>



<a name="180737195"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737195" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737195">(Nov 14 2019 at 14:50)</a>:</h4>
<p>and that's what QC does</p>



<a name="180737208"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737208" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737208">(Nov 14 2019 at 14:50)</a>:</h4>
<p><span class="user-mention" data-user-id="126931">@centril</span> okay, but creduce is a much more specialized tool</p>



<a name="180737227"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737227" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737227">(Nov 14 2019 at 14:50)</a>:</h4>
<p>for code input</p>



<a name="180737244"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737244" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737244">(Nov 14 2019 at 14:50)</a>:</h4>
<p>yea "shrinking" is standard terminology in testing</p>



<a name="180737266"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737266" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737266">(Nov 14 2019 at 14:51)</a>:</h4>
<p>/me is out of touch of what "quickcheck" describes</p>



<a name="180737272"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737272" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737272">(Nov 14 2019 at 14:51)</a>:</h4>
<p>it's not as simple as treating such a problem as an unit test though</p>



<a name="180737289"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737289" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737289">(Nov 14 2019 at 14:51)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> <a href="https://www.cs.tufts.edu/~nr/cs257/archive/john-hughes/quick.pdf" target="_blank" title="https://www.cs.tufts.edu/~nr/cs257/archive/john-hughes/quick.pdf">https://www.cs.tufts.edu/~nr/cs257/archive/john-hughes/quick.pdf</a></p>



<a name="180737294"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737294" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737294">(Nov 14 2019 at 14:51)</a>:</h4>
<p>all of those tools are designed to generate de-novo input</p>



<a name="180737399"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737399" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737399">(Nov 14 2019 at 14:52)</a>:</h4>
<p>none of the words "shrink", "reduce", nor "minimize" occur in that paper</p>



<a name="180737401"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737401" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737401">(Nov 14 2019 at 14:52)</a>:</h4>
<p><code>creduce</code> is <em>entirely</em> about small changes to input <em>code</em>, and it understands enough to avoid making unreasonable changes</p>



<a name="180737421"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737421" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737421">(Nov 14 2019 at 14:52)</a>:</h4>
<p>Well quickcheck is a 2-step problem:</p>
<ol>
<li>generate test input</li>
<li>shrink failing input to a minimum failing</li>
</ol>



<a name="180737429"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737429" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737429">(Nov 14 2019 at 14:52)</a>:</h4>
<p>to be clear: I know what quickcheck <em>was</em> (in terms of generating test input).</p>



<a name="180737442"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737442" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737442">(Nov 14 2019 at 14:52)</a>:</h4>
<p>I just didn't know it handled shrinking as well</p>



<a name="180737479"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737479" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737479">(Nov 14 2019 at 14:53)</a>:</h4>
<p>but really what I want is a refactor toolkit that lets me do various steps faster than I can by hand</p>



<a name="180737502"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737502" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737502">(Nov 14 2019 at 14:53)</a>:</h4>
<p>I'm just happy that M-x kill-sexp usually works in Emacs</p>



<a name="180737505"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737505" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737505">(Nov 14 2019 at 14:53)</a>:</h4>
<p>for Rust blocks</p>



<a name="180737506"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737506" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737506">(Nov 14 2019 at 14:53)</a>:</h4>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span>  argh; that paper is a bit dated...  <a href="https://hackage.haskell.org/package/QuickCheck-2.13.2/docs/Test-QuickCheck.html#v:shrink" target="_blank" title="https://hackage.haskell.org/package/QuickCheck-2.13.2/docs/Test-QuickCheck.html#v:shrink">https://hackage.haskell.org/package/QuickCheck-2.13.2/docs/Test-QuickCheck.html#v:shrink</a></p>



<a name="180737605"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737605" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737605">(Nov 14 2019 at 14:54)</a>:</h4>
<p>something like <code>creduce</code> would only come in when I ran out of low-hanging fruit, but even then it tends to make a mess</p>



<a name="180737641"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737641" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737641">(Nov 14 2019 at 14:54)</a>:</h4>
<p>(<code>M-x kill-sexp</code> is my current go-to method for replacing a method body with <code>{ loop { } }</code> when I need to do it repeatedly on a large body of code.)</p>



<a name="180737661"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737661" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737661">(Nov 14 2019 at 14:54)</a>:</h4>
<p><span class="user-mention" data-user-id="126931">@centril</span> yeah that looks too simple to do much for code</p>



<a name="180737676"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737676" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737676">(Nov 14 2019 at 14:55)</a>:</h4>
<p>(that or <code>-Z everybody-loops</code>, but for some reason I didn't use that in my most recent effort.)</p>



<a name="180737719"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737719" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737719">(Nov 14 2019 at 14:55)</a>:</h4>
<p><span class="user-mention" data-user-id="119009">@eddyb</span> it's simple but deceptively powerful</p>



<a name="180737743"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737743" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737743">(Nov 14 2019 at 14:55)</a>:</h4>
<p>smallcheck might make more sense for compiler inputs tho -- less random, more "search whole space up to Depth"</p>



<a name="180737754"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737754" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737754">(Nov 14 2019 at 14:55)</a>:</h4>
<p>but maybe that takes too much time</p>



<a name="180737848"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737848" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737848">(Nov 14 2019 at 14:56)</a>:</h4>
<p>"naive methods applied to ASTs produce reducers" is an extraordinary claim that I'd prefer seeing a proof of concept of before bothering to attempt</p>



<a name="180737933"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/pre-meeting%20triage%202019-11-14%20%2354818/near/180737933" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-11-14.20.2354818.html#180737933">(Nov 14 2019 at 14:57)</a>:</h4>
<p>it gets much harder with graphs</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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